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	<head>
		<meta charset="utf-8" />
		<title></title>
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	<body>
        <select id="liangzai" name="" onchange="doAction()">
        	<option value="">请选择今日的学习网站</option>
			<option value="http://www.bilibili.com">哔哩哔哩</option>
			<option value="http://www.4399.com">4399小游戏</option>
			<option value="http://www.taobao.com">淘宝</option>
        </select>
		<script type="text/javascript">
			function doAction(){
				var mengnan = document.getElementById('liangzai').value;
				location.href = mengnan;
			}
		</script>
	</body>
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